By Richard Willstätter (auth.), H. Altenburg, I. Bang, K. Bartelt, Fr. Baum, C. Brahm, W. Cramer, K. Dieterich, R. Ditmar, M. Dohrn, H. Einbeck, H. Euler, E. St. Faust, C. Funk, O. v. Fürth, O. Gerngross, V. Grafe, J. Helle, O. Hesse, K. Kautzsch, Fr. Knoop,

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Extra resources for Biochemisches Handlexikon: VI. Band Farbstoffe der Pflanzen- und der Tierwelt

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Dieser Isonitrosok6rper wird in Eisessig aufgel6st, 10% Schwefelsaure hinzugefiigt und gekocht; es scheidet sich das 3-Athoxy-3',4'-dimethoxyflavonol o /OCH 3 C2H 50 - ( i / ' f - < = > - OCHs ,,/,,;C-OH CO 1) A. G. Perkin, Journ. Chern. Soc. 71, 1194 [1897]. 2) Chevreul, Le<;ons de Chemie appliques It la teinture A 2, 150. - PreiJ3er, Journ. de Pharm. et de Chim. [3] ser. [1875]. - Bolley, Schweiz. polytechn. Zeitschr. 9, 22 [1894]. Koch, Berichte d. Deutsch. chern. Gesellschaft 5, 285 [1872].

Soc. 77,426 [1900]. A. G. Per kin, Journ. Chem. Soc. 77, 424 [19001A. G. Perkin, Journ. Chern. Soc. 71, 1131 [1897]. A. G. Perkin, Journ. Chem. Soc. n, 1135 [1897]. A. G. Per kin, Journ. Chern. Soc. 8t, 477 [1902]. Stein, Journ. f. prakt. Chemie 58, 399 [1851]; 85, 351 [1858]; 88, 280 [1861]. A. G. Perkin u. Hummel, Journ. Chern. Soc. 71, 1134 [1897]. '8) A. G. Perkin u. Phipps, Journ. Chern. Soc. 85, 56 [1904]. 11) A. G. Perkin, Journ. Chern. Soc. 95, 1855 [1909]; Chern. Centralbl. 1910, I, 288.

Darstellung: Das Rohprodunkt del' Drogen wird mehrmals aus Wasser umkrystallisiert, darauf zur Befreiung von Fett, Chlorophyll, Wachs usw. im Soxhlet mit Ather extrahiert und in kochendem Alkohol aufgenommen (zur Trennung von anorganischen Salzen). Der Alkohol wird groBtenteils verjagt und del' Riickstand in Wasser gegossen. Das nach einiger Zeit sich ausscheidende Produkt wird mehrfach aus verdiinntem Alkohol und Wasser umkrystallisiert. Physikalische und chemische Eigenschaften: Sohmelzp. 180-185°.

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